FOLIAR ABSORPTION AND TRANSLOCATION OF DICAMBA FROM AQUEOUS-SOLUTION AND DICAMBA-TREATED SOIL DEPOSITS

This study was conducted to compare foliar absorption and translocation of dicamba applied to plants as an aqueous solution or as dicamba-treated soil deposits. When applied as an aqueous solution, 65 to 95% of C-14-dicamba was absorbed by pea, alfalfa, and grape; whereas, limited absorption (0.4 to 4.7%) occurred from dicamba-treated soil. Based on dose-response evaluation, the low levels absorbed from treated soil are unlikely to cause crop damage. C-14-dicamba translocation was more than 80% of absorbed C-14 in pea, alfalfa, and grape. Acropetal translocation exceeded basipetal translocation.